// JavaScript Document
var waveObj=function()
{
	this.x=[];
	this.y=[];
	this.alive=[];
	this.r=[];
	
}
waveObj.prototype.num=10;
waveObj.prototype.init=function()
{
	for(var i=0;i<this.num;i++)
	{
		this.alive[i]=false;
		this.r[i]=0;
	}
}
waveObj.prototype.draw=function()
{	
	ctx1.save()
	ctx1.lineWidth=2;
	ctx1.shadowBlur=5;
	ctx1.shadowColor="white"
	for(var i=0;i<this.num;i++)
	{
		if(this.alive[i])
		{	
			this.r[i]+=deltaTime*0.05
			if(this.r[i]>60)
			{
				this.alive[i]=false;
			}
			var alpha=1-this.r[i]/60;
			//draw
			ctx1.beginPath()
			ctx1.arc(this.x[i],this.y[i],this.r[i],0,Math.PI*2)
			ctx1.closePath()
			ctx1.strokeStyle="rgba(255,255,255,"+alpha+")"
			ctx1.stroke();
			
			
		}
	}
	ctx1.restore();
}

waveObj.prototype.born=function(x,y)
{
	for(var i=0;i<this.num;i++)
	{
		if(!this.alive[i])
		{	
			this.alive[i]=true
			this.r[i]=15;
			this.x[i]=x;
			this.y[i]=y;
			//born
			return;
		}
	}
}